Elevator



(No Model.) 4 SheetsSheet 1.

- H. PARSONS. I

ELEVATOR.

Patented Dec. 17, 1889.

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(No Model.)

H PARSONS 4 Sheets-Sheet 2.

ELEVATOR. N0. 417,274. Patented Dec. 17,1889.

I B [L \Q /ITNEEIEE5V47 INVENTEIR wfafiwd (No Model.) 4 Sheets-Sheet 3.

. H. PARSONS.

ELEVATOR.

No. 417,274. Patented Dec. 17, 1889.

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(No Model.) 4 Sheets-Sheet 4.

H. PARSONS.

U ELEVATOR.

No. 417,274. Patented Dec. 1'7, 188.9.

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HENRY PARSONS, OF MARLBOROUGH, MASSACHUSETTS.

ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 417,274, dated December 17, 1889.

Application filed April 8, 1889. Serial No. 306,334. (No model.) I

' T0 at whom it may concern:

Be it known that I, HENRY PARSONS, of Marlborough, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Elevators, which will, in connection with the accompanying drawings, be hereinafter fully described, and specifically defined in the appended claims.

In said drawings, Figure 1 is a top plan view of the elevator hoisting devices complete as assembled for use. Fig. 2 is a sectional elevation, the section being vertical and taken on line Z, Fig. 1, and the elevation as viewed from the near edge of the sheet when it is turned to the right. Fig. 3 is a sectional elevation,the section being vertical and taken on line X, Fig. 1, and the elevation as viewed from the near edge of the sheet when it is turned to the right. Fig. 4 is a sectional elevation, the section being vertical and taken on line XV WV, Fig. 1, and the elevation as viewed from the right in that figure when the sheet is turned to the right. Fig. 5 is a detail of a part shown in Fig. 4, to be explained. Fig. 6 is a sectional elevation, the section being vertical and taken on line V, Fig. 1, and the elevation as viewed from the right when the sheet is turned to the right. Fig. 7 is a sectional elevation, the section being Vertical and taken on line T, Fig. 1, and the elevation as viewed from the left when the sheet is turned to the right. Fig. 8 is an elevation showing a detail of-one of the beltshipping devices. Fig. 9 is an elevation showing a detail of one of the stops. Fig.

i 10 is a horizontal section taken through the axis of the parts shown in Fig. 9, as when they are assembled. Fig. 11 is a side elevation of a portion of the gear-casing. Fig. 12 is a detached perspective view of the clutchshipper fork and its weighted lever.

This invention relates to that part of freight and passenger elevators by which the cage or carriage, as it isindifferent-ly termed, is raised and lowered, which said part consists, essentially, of a drum for the hoisting-rope, a gearing by which the drum may be rotated in both directions, with pulleys for actuating said gearing, a belt-shipping device operated by hand, a brake, and an automatic belt-shipping device to stop the machine when the elevator reaches its highest or lowest intended limit; and my invention consists in means whereby, through the slackening of the hoisting-rope from any cause, the then drivingbelt will be automatically shifted to a loose pulley, the brake applied, and the uncoiling of the rope from the drum instantly stopped, as will, in connection with said drawings, be hereinafter fully described, and pointed out in the claims.

Referring again to said drawings, A'represents the bed or frame of the hoisting apparatus, and B is the grooved rope-carrying drum secured on arbor b d, journaled in suitable bearings on said frame, as shown. A tangentwheel E is shown as bolted to the end of duly supported in proper journal-bearings in frame A, as shown, said tangent-wheel and endless screw constituting the wellknown worm-gear, by which the drum is rotated in either direction, according as it is desired to either raise or lower the cage, by means of rope a, that is secured to the cage and is wound upon and unwound from the drum. Said endless screw is thus driven by means of fast pulley C and loose pulleys D D on arbor G and the usual two belts arranged on said pulleys and running in opposite directions, in a well-known manner, it being obvious that when either belt is on fast pulley O the drum will then be driven in accordance with the direction of movement of suchbelt, that when either belt is on pulley C the other belt is on its loose pulley D, and that when both belts are on'their respect ive loose pulleys then the machine is inoperative; and for the purpose of thus shipping the belts", as desired, the following devices are employed: Two belt-forks 20 are rigidly secured upon their respective shipper-bars t, which at their outer ends slide in the supports 21, while at their inner ends they are pivoted to the head of rocking levers n, which are loosely mounted on shaft .9, While above shaft- 3 is journaled the shipper-shaft cl, which carries the cams m m,rigidly secured upon it. In the side of each of said cams is formed a groove 19, in which is IOC inserted a pin (1 of the levers b, said groove being concentric to the axis of shaft d except at one of its terminals, where it converges toward the shaft, as shown in Figs. 3 and 8, said c'ams being so set upon their shaft and reversed in their position relatively to each other that either belt may be moved onto fast pulley O or both may be moved onto their respective loose pulleys, it being obvious and well known that neither lever will be rocked by the rotation of its cam except when the pin q on the lever is moving in the converging portion of the cam-groove, and when said pins are in the concentric portion of their respective grooves then the belts are on their respective loose pulleys, and hence by rocking the shaft d in the proper direction the intended belt may be moved onto the fast pulley. A stop-cam 70, Fig. 5, being secured on said shaft d and arranged to engage a stop Z, that rises from bed A, and so adjusted relatively to cam that when shaft d has been rotated in either direction to the extent that 'the belt being shipped is evenly on the fast pulley C, said stop will be encountered by the cam is and the rotation of the shaft arrested. In order to rotate shaft (Z byhand, either to start or stop the cage, a pulley c is secured on shaft d, and an endless shipping cord placed thereon extends down the well through the cage and passes over a pulley at the bottom of the Well, and is thus accessible to the operator who runs the elevator, who, by d rawing said cord in the proper direction, can, by means specified, bring either belt onto or off the fast pulley.

For the purpose of automatically unshipping the belt from the fast pulley when the cage reaches the highest or lowest limit, a sprocket f is mounted to slide lineally 011 shaft cl, but is interlocked therewith by aspline, key, or feather, as it is indifferently termed, which enters a keyway or slot cut in each, such slot extending preferably the length of the shaft, as shown in Fig.

.1. Said sprocket is engaged and driven by an endless chain g, that engages and is intermittently driven by sprocket h, threaded on- .sprocket it will move toward disk 1' or j, ac-

cording to the direction in which shaft Z; isbeing rotated, and that hence, when the stud on sprocket h comes in contact with the stud on the disk that it is approaching, the chain will rotate shaft cl, and through the means already described will ship the then driving-belt from the fast to the loose pulley, and so stop the machine.

For the purpose of looking drum B, and consequently holding immovable the cage that is therefrom suspended, a brake-wheel c is rigidly secured on shaft G, and is inclosed by a friction-band 10, secured at its lineal cen ter to support 11, and at its ends attached to cars of lever 8, arranged on opposite sides of its pivotal support 12, secured in standard 13, as shown in Fig. 6, so that when said lever is forced downward by its weight 9 said band is thereby constricted upon the wheel and brakes the same. To raise said brake-lever and its weight, I rigidly secure on shaft 8 an angle-lever 5, the horizontal arm of which is connected with lever 8 by a short stirrup or link'7, while its upper arm carries a trundle 6, that bears upon the peripheral face of cam 4, secured on shaft d, said cam having a depression at one point in its periphery, into which the said trundle in lever 5 can retire, as shown in Fig. 3, so that its horizontal arm may descend and thereby allow the brake weight and lever to lock wheel a, and thus stop the drum B and the movement of the cage, as stated, said cam 4 being so set or positioned on its shaft as that the brake will be applied to stop the machine immediately after the driving-belt has been shipped upon its loose pulley.

For the purpose of properly adjusting disks {j in order that their projections may interlock with the projections on sprocket h at the desired point of its movement, said disks have a certain number of bolt-holes near their periphery, (see Figs. 9 and 10,) while disks 2526, which by their hubs are rigidly secured to shaft b, have each a different number of holes, (see Fig. 9,) either one more or one less than do disks M; and hence, as but one bolt 27is employed to secure disks 2' j to their respective fast disks 25 26, therefore a very slight rotation of disks '2' j will bring a bolthole in each into coincidence for the insertion of the seouring-bolt27.

As the cage is from various causes liable to be temporarily held from descending coincidently with the uncoiling of rope a, by which it is suspended from drum B, and is also liable, after the rope has uncoiled to a limited extent, to fall andbreak the rope or other parts, I have invented the following means by which to instantly stop the movement of the drum when the rope has thus slackened.

A sprocket a, secured on shaft 1) to rotate therewith, is connected by means of chain a with sprocket n, that habitually revolves freely on shaft (Z, but which is toothed upon one plane or side, and when slid into engagment with the oorrespondingly-toothed clutch w, rigidly secured on shaft d, will insure the rotation thereof, thereby through the means already described shifting the belt to the loose pulley and applying thebrake. To thus slide sprocket 1 into engagement with clutch w, I employ a forked angle-lever m, the prongs of which engage in a concentric groove in the hub of the sprocket, as shown in Fig. 1, said lever being pivoted by its central tubular portion 28,Which is arranged on stud 29, supported in hub y,

secured to base A, Fig. 2. Formed upon or secured to said tubular portion 28 is a horizontal arm 2, provided with weight 3, of such avoirdupo is that when released (as will be explained) it will move sprocket 'v into ongagement with clutch to for the purpose al ready specified. To habitually support arm 2 and its weight 3, I pivot a curved lever 14 upon stud 15, secured in the casing 16 of tangent-wheel E, the lower end of said lever being formed with an angle or foot 19, upon which said weighted arm 2 is supported when the outer longer arm is supported, as shownthat is, a rod 17 rigidly secured in said arm, as shown, extends across the face of drum B parallel with its axis, and on this rod is the traveling groove-faced pulley or roll 18, engaging rope a, which, so long as the rope a is held taut by the cage, thereby supports the lever in position, as shown; but should the cage from any cause fail to descend coincid-ently with the uncoiling of the rope then roll 18 and the outer arm of its lever 14 would move downward as the rope slackened to such limited extent as to allow foot 19 to be withdrawn from weighted lever 2, thereby engaging sprocket v with clutch to, when the belt would be shipped to a loose pulley, the brake applied, and the machine brought to a stand still before the rope had materially slackened or so as to allow the dropping of the car.

It is obvious that a line projected to pass through the axis of pivot 15 of lever 14: and the axis of rod 17 would be at such an angle to the vertical line of the rope as that a very slight slackening of the latter would allow the disengagementof the foot of the lever 14 from the weighted lever 2.

Instead of supporting rod 17 at one end only, asshown, it may be supported at both ends by means of two levers 14, rigidly united or formed integrally, in both which levers said rod would be secured, and in such case but one of said levers 14 need extend below support 15, as but one need engage weighted lever-V2. It will also be obvious that a plurality of ropes a may be employed, if preferred.

I am aware that it is common 'to arrange a lever beneath the hoisting-rope drum to be actuated by the weight of the hoisting-rope when slackened, so asto bear upon said lever, which latter is arranged to actuate a clutch by which the belt will be unshipped from the drivillgpulley; but my invention is v altogether unlike, both in its construction and mode of operation, such old device, as my device is rendered operative by the mere slackening of the rope, and will operate with equal certainty at all times if the rope slackens,whil e said older device depends for its efficiency upon the rope resting upon the lever, and hence will not operate when the amount of rope depending in the well below the sustaining-sheave is greater than that between said sheave and the drum, as such depending portion will in that case hold the other taut and prevent its resting upon the lever to actuate the same.

I claim as my invention.

1. 111 an elevator, the combination of a sprocket secured on the drum-shaft, a toothed sprocket loose on the shipper-shaft, an endless chain connecting said sprockets, a clutch rigidly secured on the shipper-shaft and toothed to interlock with said toothed sprocket, a weighted lever interlocked with said toothed sprocket and arranged, when liber ated, to engage said sprocket with the clutch, a lever arranged to engage and sustain said sprocket-actuating lever and carrying a traveling roll that bears against the hoistingrope, said lever and its roll being so arranged that when the rope slackens said lever will falltand liberate the sprocket-actuating lever, whereby the shipper-shaft will be rotaied, the belt shifted, and the brake applied, all substantially as specified.

2. In an elevator, the combination of a sprocket u, secured on drum-shaft b, a sprocket t, loosely mounted on a shipper-shaft d and toothed or indented at one of its sides, a chain z, connecting said sprockets, a toothed clutch to, rigidly secured on shaft (Z, the shipper or, engaging said toothed sprocket and having weighted arm 2 to actuate it, a lever 14:, duly pivoted and formed to sustain saidweighted arm, a rod 17, carried by a lever 14, and a sheave or roll 18, arranged to revolve and travel on said rod, all substantially as speciiied.

HENRY PARSONS.

Witnesses:

T. W. PORTER, EUGENE HUMPHREY. 

